using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEditor;
using XRLib;
using XED.UI;

namespace XED.UI
{
    //TODO::areabox°¡ ¾Æ´Ï¶ó TwinObject¸¦ ´ë»óÀ¸·Î µ¿ÀÛÇϵµ·Ï ¼öÁ¤
    public class ObjectDistanceLine : MonoBehaviour, ISingle
    {
        private Vector3 centerPoint = new();
        private Vector3[] edges = new Vector3[4];

        private LineRenderer[] lineRenderers = new LineRenderer[4];
        private int[] distances = new int[4];
        private Vector3[] hits = new Vector3[4];
        [SerializeField]
        private float thickness;

        private int rot;
        private Dictionary<Vector3, Vector3> dirTable = new();
        
        TwinObject target;
        HashSet<TwinObject> targets = new();
        public event Action onTargetEvent;
        public event Action onTargetMissing;
        public event Action<Vector3, int, int> onLineUpdate;

        public void Initialize()
        {
            var lineMat = Resources.Load<Material>("Materials/Mat_LineRender");
            for (int i = 0; i < lineRenderers.Length; i++)
            {
                lineRenderers[i] = new GameObject("DistanceLine").AddComponent<LineRenderer>();
                lineRenderers[i].transform.SetParent(transform, true);
                lineRenderers[i].material = lineMat;
                lineRenderers[i].positionCount = 2;
                lineRenderers[i].startWidth = thickness;
                lineRenderers[i].endWidth = thickness;
            }
        }

        public void SetTarget(TwinObject target)
        {
            if (target is Wall || target is WallGroup)
                return;
            this.target = target;
            targets.Add(target);
            gameObject.SetActive(true);
            onTargetEvent?.Invoke();
        }

        private void EdgePoints()
        {
            var size = target.physics.areabox.bounds.size;
            edges[0] = centerPoint + EdgePointCalculate(-size.x, -size.z, centerPoint);
            edges[1] = centerPoint + EdgePointCalculate(size.x, -size.z, centerPoint);
            edges[2] = centerPoint + EdgePointCalculate(size.x, size.z, centerPoint);
            edges[3] = centerPoint + EdgePointCalculate(-size.x, size.z, centerPoint);
        }

        private void CenterPoints()
        {
            var size = target.physics.areabox.bounds.size;
            edges[0] = centerPoint + EdgePointCalculate(-size.x, 0f, centerPoint);
            edges[1] = centerPoint + EdgePointCalculate(size.x, 0f, centerPoint);
            edges[2] = centerPoint + EdgePointCalculate(0f, -size.z, centerPoint);
            edges[3] = centerPoint + EdgePointCalculate(0f, size.z, centerPoint);
        }
        private Vector3 EdgePointCalculate(float xValue, float zValue, Vector3 center)
        {
            //´ë°¢¼±ÀÇ ±æÀÌ, 
            //ÁßÁ¡±æÀÌ
            var point = center + (new Vector3(xValue, 0, zValue) * 0.5f);
            var length = Vector3.Distance(point, center);
            var dir = (point - center).normalized * length;
            //var pos = RotateVector3(dir, rot);
            var pos = Quaternion.AngleAxis(rot, Vector3.up) * dir;
            return pos;
        }

        public void Off()
        {
            targets.Clear();
            onTargetMissing?.Invoke(); 
        }

        void LineRenderSetActive(bool isActive)
        {
            foreach(var line in lineRenderers)
            {
                line.enabled = isActive;
            }
        }
        private void Update()
        {
            if (target == null || targets.Count >1)
            {
                Off();
                LineRenderSetActive(false);
                return;
            }

            //if (areabox == null)
            //    return;
            //Distance°¡ 4°³ ¸ðµÎ 0À̸é return?
            LineRenderSetActive(true);
            rot = Mathf.RoundToInt(target.physics.areabox.transform.localEulerAngles.y);
            centerPoint = new Vector3(target.physics.areabox.bounds.center.x, 0, target.physics.areabox.bounds.center.z);

            var angle = rot % 90f;
            if (Mathf.Approximately(angle, 0f))
                CenterPoints();
            else
                EdgePoints();

            var xOrder = edges.OrderBy(l => l.x);
            var zOrder = edges.OrderBy(l => l.z);
            dirTable.Clear();
            dirTable.TryAdd(xOrder.ElementAt(0), Vector3.left);
            dirTable.TryAdd(xOrder.ElementAt(3), Vector3.right);
            dirTable.TryAdd(zOrder.ElementAt(0), Vector3.back);
            dirTable.TryAdd(zOrder.ElementAt(3), Vector3.forward);

            for (int i = 0; i < edges.Length; i++)
            {
                //var dir = Dir(dirTable[edges[i]]);
                var dir = dirTable[edges[i]];
                if (Physics.Raycast(edges[i], dir, out RaycastHit hit, Mathf.Infinity))
                {
                    hits[i] = hit.point;
                }
                else
                {
                    hits[i] = edges[i];
                }
                distances[i] = Mathf.RoundToInt(Vector3.Distance(hits[i], edges[i]) * 1000f);
                
                lineRenderers[i].SetPosition(0, edges[i]);
                lineRenderers[i].SetPosition(1, hits[i]);
                //3¹æÇâÁß Á¡Áß °¡Àå ªÀº°Å

                var pos = DistanceTextPos(edges[i], hits[i]);
                if (Mathf.Abs(pos.y) == Mathf.Infinity || float.IsNaN(pos.y))
                    continue;
                onLineUpdate?.Invoke(pos, i, distances[i]);
            }
        }

        private Vector3 DistanceTextPos(Vector3 edge, Vector3 hit)
        {
            var x = Screen.width;
            var y = Screen.height;

            var hitpoint = Camera.main.WorldToScreenPoint(hit);
            var edgePoint = Camera.main.WorldToScreenPoint(edge);

            //Ä«¸Þ¶ó ³¡Á¡ edge¿Í hit »çÀÌ;

            //±â¿ï±â °¡Á®¿Â´Ù 
            var m = (hitpoint.y - edgePoint.y) / (hitpoint.x - edgePoint.x);
            if (hitpoint.y > y)
            {
                var yPos = y;
                var xPos = ((yPos - edgePoint.y) / m) + edgePoint.x;
                hitpoint = new Vector3(xPos, yPos);
            }
            else if (hitpoint.y < 0)
            {
                var yPos = 0;
                var xPos = ((yPos - edgePoint.y) / m) + edgePoint.x;
                hitpoint = new Vector3(xPos, yPos);
            }

            if (hitpoint.x > x)
            {
                var xPos = x;
                var yPos = (m * (xPos - edgePoint.x)) + edgePoint.y;
                hitpoint = new Vector3(xPos, yPos);
            }
            else if (hitpoint.x < 0)
            {
                var xPos = 0;
                var yPos = (m * (xPos - edgePoint.x)) + edgePoint.y;
                hitpoint = new Vector3(xPos, yPos);
            }

            var center = (hitpoint + edgePoint) * 0.5f;
            return center;
        }

        void Gizmo()
        {
#if UNITY_EDITOR
//            for (int i = 0; i < edges.Length; ++i)
//            {
//                Gizmos.DrawSphere(edges[i].pos, 0.1f);
//            }

//            for (int i = 0; i < hits.Length; ++i)
//            {
//                var dir = Dir(dirTable[edges[i]]);
//                Handles.color = Color.yellow;
//                Handles.DrawLine(edges[i].pos, hits[i], 1);
//                Gizmos.DrawRay(edges[i].pos, dir * 10f);
//            }
#endif
        }
    }
}